Reference Sensing Node Techniques for Cellular-Based Radio Frequency Sensing

Aspects of the disclosure relate generally to wireless technologies.

Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G), a second-generation (2G) digital wireless phone service (including interim 2.5G and 2.75G networks), a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., Long Term Evolution (LTE) or WiMax). There are presently many different types of wireless communication systems in use, including cellular and personal communications service (PCS) systems. Examples of known cellular systems include the cellular analog advanced mobile phone system (AMPS), and digital cellular systems based on code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), the Global System for Mobile communications (GSM), etc.

A fifth generation (5G) wireless standard, referred to as New Radio (NR), enables higher data transfer speeds, greater numbers of connections, and better coverage, among other improvements. The 5G standard, according to the Next Generation Mobile Networks Alliance, is designed to provide higher data rates as compared to previous standards, more accurate positioning (e.g., based on reference signals for positioning (RS-P), such as downlink, uplink, or sidelink positioning reference signals (PRS)), radio frequency (RF) sensing, and other technical enhancements. These enhancements, as well as the use of higher frequency bands, advances in PRS processes and technology, and high-density deployments for 5G, enable highly accurate 5G-based sensing and positioning.

The following presents a simplified summary relating to one or more aspects disclosed herein. Thus, the following summary should not be considered an extensive overview relating to all contemplated aspects, nor should the following summary be considered to identify key or critical elements relating to all contemplated aspects or to delineate the scope associated with any particular aspect. Accordingly, the following summary has the sole purpose to present certain concepts relating to one or more aspects relating to the mechanisms disclosed herein in a simplified form to precede the detailed description presented below.

In an aspect, a method of wireless sensing performed by a reference sensing node includes receiving a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and transmitting, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a method of wireless sensing performed by a receiver sensing node includes receiving a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and receiving, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a method of wireless sensing performed by a reference sensing node includes receiving, from a network node, one or more repetitions of a periodically transmitted reference signal; and transmitting, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more occasions of the periodically transmitted reference signal.

In an aspect, a reference sensing node includes one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and transmit, via the one or more transceivers, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a receiver sensing node includes one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and receive, via the one or more transceivers, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a reference sensing node includes one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, from a network node, one or more repetitions of a periodically transmitted reference signal; and transmit, via the one or more transceivers, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

In an aspect, a reference sensing node includes means for receiving a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and means for transmitting, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a receiver sensing node includes means for receiving a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and means for receiving, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a reference sensing node includes means for receiving, from a network node, one or more repetitions of a periodically transmitted reference signal; and means for transmitting, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

In an aspect, a non-transitory computer-readable medium stores computer-executable instructions that, when executed by a reference sensing node, cause the reference sensing node to: receive a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and transmit, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a non-transitory computer-readable medium stores computer-executable instructions that, when executed by a receiver sensing node, cause the receiver sensing node to: receive a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and receive, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

In an aspect, a non-transitory computer-readable medium stores computer-executable instructions that, when executed by a reference sensing node, cause the reference sensing node to: receive, from a network node, one or more repetitions of a periodically transmitted reference signal; and transmit, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

Other objects and advantages associated with the aspects disclosed herein will be apparent to those skilled in the art based on the accompanying drawings and detailed description.

Aspects of the disclosure are provided in the following description and related drawings directed to various examples provided for illustration purposes. Alternate aspects may be devised without departing from the scope of the disclosure. Additionally, well-known elements of the disclosure will not be described in detail or will be omitted so as not to obscure the relevant details of the disclosure.

Various aspects relate generally to wireless sensing. Some aspects more specifically relate to using a positioning reference unit (PRU) for radio frequency (RF) sensing. In some examples, a PRU may be enhanced with additional functionalities for bistatic RF sensing, such as calibration functionality for user equipment (UE)-to-base station, base station-to-UE, and UE-to-UE bistatic RF sensing, using the PRU as a party in RF sensing, and triggering conditions for using the PRU for RF sensing.

Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, by using a PRU for RF sensing operations, the described techniques can be used to reduce signaling overhead for RF sensing (as less signaling is required for PRU sensing operations) and improve RF sensing performance (by using the PRU for calibration).

The words “exemplary” and/or “example” are used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” and/or “example” is not necessarily to be construed as preferred or advantageous over other aspects. Likewise, the term “aspects of the disclosure” does not require that all aspects of the disclosure include the discussed feature, advantage or mode of operation.

Those of skill in the art will appreciate that the information and signals described below may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description below may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof, depending in part on the particular application, in part on the desired design, in part on the corresponding technology, etc.

Further, many aspects are described in terms of sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs)), by program instructions being executed by one or more processors, or by a combination of both. Additionally, the sequence(s) of actions described herein can be considered to be embodied entirely within any form of non-transitory computer-readable storage medium having stored therein a corresponding set of computer instructions that, upon execution, would cause or instruct an associated processor of a device to perform the functionality described herein. Thus, the various aspects of the disclosure may be embodied in a number of different forms, all of which have been contemplated to be within the scope of the claimed subject matter. In addition, for each of the aspects described herein, the corresponding form of any such aspects may be described herein as, for example, “logic configured to” perform the described action.

As used herein, the terms “user equipment” (UE) and “base station” are not intended to be specific or otherwise limited to any particular radio access technology (RAT), unless otherwise noted. In general, a UE may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, consumer asset locating device, wearable (e.g., smartwatch, glasses, augmented reality (AR)/virtual reality (VR) headset, etc.), vehicle (e.g., automobile, motorcycle, bicycle, etc.), Internet of Things (IoT) device, etc.) used by a user to communicate over a wireless communications network. A UE may be mobile or may (e.g., at certain times) be stationary, and may communicate with a radio access network (RAN). As used herein, the term “UE” may be referred to interchangeably as an “access terminal” or “AT,” a “client device,” a “wireless device,” a “subscriber device,” a “subscriber terminal,” a “subscriber station,” a “user terminal” or “UT,” a “mobile device,” a “mobile terminal,” a “mobile station,” or variations thereof. Generally, UEs can communicate with a core network via a RAN, and through the core network the UEs can be connected with external networks such as the Internet and with other UEs. Of course, other mechanisms of connecting to the core network and/or the Internet are also possible for the UEs, such as over wired access networks, wireless local area network (WLAN) networks (e.g., based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specification, etc.) and so on.

A base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP), a network node, a NodeB, an evolved NodeB (eNB), a next generation eNB (ng-eNB), a New Radio (NR) Node B (also referred to as a gNB or gNodeB), etc. A base station may be used primarily to support wireless access by UEs, including supporting data, voice, and/or signaling connections for the supported UEs. In some systems a base station may provide purely edge node signaling functions while in other systems it may provide additional control and/or network management functions. A communication link through which UEs can send signals to a base station is called an uplink (UL) channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc.). A communication link through which the base station can send signals to UEs is called a downlink (DL) or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.). As used herein the term traffic channel (TCH) can refer to either an uplink/reverse or downlink/forward traffic channel.

The term “base station” may refer to a single physical transmission-reception point (TRP) or to multiple physical TRPs that may or may not be co-located. For example, where the term “base station” refers to a single physical TRP, the physical TRP may be an antenna of the base station corresponding to a cell (or several cell sectors) of the base station. Where the term “base station” refers to multiple co-located physical TRPs, the physical TRPs may be an array of antennas (e.g., as in a multiple-input multiple-output (MIMO) system or where the base station employs beamforming) of the base station. Where the term “base station” refers to multiple non-co-located physical TRPs, the physical TRPs may be a distributed antenna system (DAS) (a network of spatially separated antennas connected to a common source via a transport medium) or a remote radio head (RRH) (a remote base station connected to a serving base station). Alternatively, the non-co-located physical TRPs may be the serving base station receiving the measurement report from the UE and a neighbor base station whose reference radio frequency (RF) signals the UE is measuring. Because a TRP is the point from which a base station transmits and receives wireless signals, as used herein, references to transmission from or reception at a base station are to be understood as referring to a particular TRP of the base station.

In some implementations that support positioning of UEs, a base station may not support wireless access by UEs (e.g., may not support data, voice, and/or signaling connections for UEs), but may instead transmit reference signals to UEs to be measured by the UEs, and/or may receive and measure signals transmitted by the UEs. Such a base station may be referred to as a positioning beacon (e.g., when transmitting signals to UEs) and/or as a location measurement unit (e.g., when receiving and measuring signals from UEs).

An “RF signal” comprises an electromagnetic wave of a given frequency that transports information through the space between a transmitter and a receiver. As used herein, a transmitter may transmit a single “RF signal” or multiple “RF signals” to a receiver. However, the receiver may receive multiple “RF signals” corresponding to each transmitted RF signal due to the propagation characteristics of RF signals through multipath channels. The same transmitted RF signal on different paths between the transmitter and receiver may be referred to as a “multipath” RF signal. As used herein, an RF signal may also be referred to as a “wireless signal” or simply a “signal” where it is clear from the context that the term “signal” refers to a wireless signal or an RF signal.

1 FIG. 100 100 102 104 102 100 100 illustrates an example wireless communications system, according to aspects of the disclosure. The wireless communications system(which may also be referred to as a wireless wide area network (WWAN)) may include various base stations(labeled “BS”) and various UEs. The base stationsmay include macro cell base stations (high power cellular base stations) and/or small cell base stations (low power cellular base stations). In an aspect, the macro cell base stations may include eNBs and/or ng-eNBs where the wireless communications systemcorresponds to an LTE network, or gNBs where the wireless communications systemcorresponds to a NR network, or a combination of both, and the small cell base stations may include femtocells, picocells, microcells, etc.

102 170 122 170 172 172 170 170 172 102 104 172 104 172 102 104 104 172 150 104 172 170 128 The base stationsmay collectively form a RAN and interface with a core network(e.g., an evolved packet core (EPC) or a 5G core (5GC)) through backhaul links, and through the core networkto one or more location servers(e.g., a location management function (LMF) or a secure user plane location (SUPL) location platform (SLP)). The location server(s)may be part of core networkor may be external to core network. A location servermay be integrated with a base station. A UEmay communicate with a location serverdirectly or indirectly. For example, a UEmay communicate with a location servervia the base stationthat is currently serving that UE. A UEmay also communicate with a location serverthrough another path, such as via an application server (not shown), via another network, such as via a wireless local area network (WLAN) access point (AP) (e.g., APdescribed below), and so on. For signaling purposes, communication between a UEand a location servermay be represented as an indirect connection (e.g., through the core network, etc.) or a direct connection (e.g., as shown via direct connection), with the intervening nodes (if any) omitted from a signaling diagram for clarity.

102 102 134 In addition to other functions, the base stationsmay perform functions that relate to one or more of transferring user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stationsmay communicate with each other directly or indirectly (e.g., through the EPC/5GC) over backhaul links, which may be wired or wireless.

102 104 102 110 102 110 110 The base stationsmay wirelessly communicate with the UEs. Each of the base stationsmay provide communication coverage for a respective geographic coverage area. In an aspect, one or more cells may be supported by a base stationin each geographic coverage area. A “cell” is a logical communication entity used for communication with a base station (e.g., over some frequency resource, referred to as a carrier frequency, component carrier, carrier, band, or the like), and may be associated with an identifier (e.g., a physical cell identifier (PCI), an enhanced cell identifier (ECI), a virtual cell identifier (VCI), a cell global identifier (CGI), etc.) for distinguishing cells operating via the same or a different carrier frequency. In some cases, different cells may be configured according to different protocol types (e.g., machine-type communication (MTC), narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB), or others) that may provide access for different types of UEs. Because a cell is supported by a specific base station, the term “cell” may refer to either or both of the logical communication entity and the base station that supports it, depending on the context. In addition, because a TRP is typically the physical transmission point of a cell, the terms “cell” and “TRP” may be used interchangeably. In some cases, the term “cell” may also refer to a geographic coverage area of a base station (e.g., a sector), insofar as a carrier frequency can be detected and used for communication within some portion of geographic coverage areas.

102 110 110 110 102 110 110 102 While neighboring macro cell base stationgeographic coverage areasmay partially overlap (e.g., in a handover region), some of the geographic coverage areasmay be substantially overlapped by a larger geographic coverage area. For example, a small cell base station′ (labeled “SC” for “small cell”) may have a geographic coverage area′ that substantially overlaps with the geographic coverage areaof one or more macro cell base stations. A network that includes both small cell and macro cell base stations may be known as a heterogeneous network. A heterogeneous network may also include home eNBs (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG).

120 102 104 104 102 102 104 120 120 The communication linksbetween the base stationsand the UEsmay include uplink (also referred to as reverse link) transmissions from a UEto a base stationand/or downlink (DL) (also referred to as forward link) transmissions from a base stationto a UE. The communication linksmay use MIMO antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication linksmay be through one or more carrier frequencies. Allocation of carriers may be asymmetric with respect to downlink and uplink (e.g., more or less carriers may be allocated for downlink than for uplink).

100 150 152 154 152 150 The wireless communications systemmay further include a wireless local area network (WLAN) access point (AP)in communication with WLAN stations (STAs)via communication linksin an unlicensed frequency spectrum (e.g., 5 GHz). When communicating in an unlicensed frequency spectrum, the WLAN STAsand/or the WLAN APmay perform a clear channel assessment (CCA) or listen before talk (LBT) procedure prior to communicating in order to determine whether the channel is available.

102 102 150 102 The small cell base station′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell base station′ may employ LTE or NR technology and use the same 5 GHz unlicensed frequency spectrum as used by the WLAN AP. The small cell base station′, employing LTE/5G in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network. NR in unlicensed spectrum may be referred to as NR-U. LTE in an unlicensed spectrum may be referred to as LTE-U, licensed assisted access (LAA), or MULTEFIRE®.

100 180 182 180 182 184 102 The wireless communications systemmay further include a millimeter wave (mmW) base stationthat may operate in mmW frequencies and/or near mmW frequencies in communication with a UE. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band may be referred to as a millimeter wave. Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave. Communications using the mmW/near mmW radio frequency band have high path loss and a relatively short range. The mmW base stationand the UEmay utilize beamforming (transmit and/or receive) over a mmW communication linkto compensate for the extremely high path loss and short range. Further, it will be appreciated that in alternative configurations, one or more base stationsmay also transmit using mmW or near mmW and beamforming. Accordingly, it will be appreciated that the foregoing illustrations are merely examples and should not be construed to limit the various aspects disclosed herein.

Transmit beamforming is a technique for focusing an RF signal in a specific direction. Traditionally, when a network node (e.g., a base station) broadcasts an RF signal, it broadcasts the signal in all directions (omni-directionally). With transmit beamforming, the network node determines where a given target device (e.g., a UE) is located (relative to the transmitting network node) and projects a stronger downlink RF signal in that specific direction, thereby providing a faster (in terms of data rate) and stronger RF signal for the receiving device(s). To change the directionality of the RF signal when transmitting, a network node can control the phase and relative amplitude of the RF signal at each of the one or more transmitters that are broadcasting the RF signal. For example, a network node may use an array of antennas (referred to as a “phased array” or an “antenna array”) that creates a beam of RF waves that can be “steered” to point in different directions, without actually moving the antennas. Specifically, the RF current from the transmitter is fed to the individual antennas with the correct phase relationship so that the radio waves from the separate antennas add together to increase the radiation in a desired direction, while cancelling to suppress radiation in undesired directions.

Transmit beams may be quasi-co-located, meaning that they appear to the receiver (e.g., a UE) as having the same parameters, regardless of whether or not the transmitting antennas of the network node themselves are physically co-located. In NR, there are four types of quasi-co-location (QCL) relations. Specifically, a QCL relation of a given type means that certain parameters about a second reference RF signal on a second beam can be derived from information about a source reference RF signal on a source beam. Thus, if the source reference RF signal is QCL Type A, the receiver can use the source reference RF signal to estimate the Doppler shift, Doppler spread, average delay, and delay spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type B, the receiver can use the source reference RF signal to estimate the Doppler shift and Doppler spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type C, the receiver can use the source reference RF signal to estimate the Doppler shift and average delay of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type D, the receiver can use the source reference RF signal to estimate the spatial receive parameter of a second reference RF signal transmitted on the same channel.

In receive beamforming, the receiver uses a receive beam to amplify RF signals detected on a given channel. For example, the receiver can increase the gain setting and/or adjust the phase setting of an array of antennas in a particular direction to amplify (e.g., to increase the gain level of) the RF signals received from that direction. Thus, when a receiver is said to beamform in a certain direction, it means the beam gain in that direction is high relative to the beam gain along other directions, or the beam gain in that direction is the highest compared to the beam gain in that direction of all other receive beams available to the receiver. This results in a stronger received signal strength (e.g., reference signal received power (RSRP), reference signal received quality (RSRQ), signal-to-interference-plus-noise ratio (SINR), etc.) of the RF signals received from that direction.

Transmit and receive beams may be spatially related. A spatial relation means that parameters for a second beam (e.g., a transmit or receive beam) for a second reference signal can be derived from information about a first beam (e.g., a receive beam or a transmit beam) for a first reference signal. For example, a UE may use a particular receive beam to receive a reference downlink reference signal (e.g., synchronization signal block (SSB)) from a base station. The UE can then form a transmit beam for sending an uplink reference signal (e.g., sounding reference signal (SRS)) to that base station based on the parameters of the receive beam.

Note that a “downlink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the downlink beam to transmit a reference signal to a UE, the downlink beam is a transmit beam. If the UE is forming the downlink beam, however, it is a receive beam to receive the downlink reference signal. Similarly, an “uplink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the uplink beam, it is an uplink receive beam, and if a UE is forming the uplink beam, it is an uplink transmit beam.

The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz-300 GHz) which is identified by the INTERNATIONAL TELECOMMUNICATION UNION® as a “millimeter wave” band.

The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Recent 5G NR studies have identified an operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz-24.25 GHz). Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6 GHz-71 GHz), FR4 (52.6 GHz-114.25 GHz), and FR5 (114.25 GHz-300 GHz). Each of these higher frequency bands falls within the EHF band.

With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.

104 182 104 182 104 104 182 104 182 In a multi-carrier system, such as 5G, one of the carrier frequencies is referred to as the “primary carrier” or “anchor carrier” or “primary serving cell” or “PCell,” and the remaining carrier frequencies are referred to as “secondary carriers” or “secondary serving cells” or “SCells.” In carrier aggregation, the anchor carrier is the carrier operating on the primary frequency (e.g., FR1) utilized by a UE/and the cell in which the UE/either performs the initial radio resource control (RRC) connection establishment procedure or initiates the RRC connection re-establishment procedure. The primary carrier carries all common and UE-specific control channels, and may be a carrier in a licensed frequency (however, this is not always the case). A secondary carrier is a carrier operating on a second frequency (e.g., FR2) that may be configured once the RRC connection is established between the UEand the anchor carrier and that may be used to provide additional radio resources. In some cases, the secondary carrier may be a carrier in an unlicensed frequency. The secondary carrier may contain only necessary signaling information and signals, for example, those that are UE-specific may not be present in the secondary carrier, since both primary uplink and downlink carriers are typically UE-specific. This means that different UEs/in a cell may have different downlink primary carriers. The same is true for the uplink primary carriers. The network is able to change the primary carrier of any UE/at any time. This is done, for example, to balance the load on different carriers. Because a “serving cell” (whether a PCell or an SCell) corresponds to a carrier frequency/component carrier over which some base station is communicating, the term “cell,” “serving cell,” “component carrier,” “carrier frequency,” and the like can be used interchangeably.

1 FIG. 102 102 180 104 182 For example, still referring to, one of the frequencies utilized by the macro cell base stationsmay be an anchor carrier (or “PCell”) and other frequencies utilized by the macro cell base stationsand/or the mmW base stationmay be secondary carriers (“SCells”). The simultaneous transmission and/or reception of multiple carriers enables the UE/to significantly increase its data transmission and/or reception rates. For example, two 20 MHz aggregated carriers in a multi-carrier system would theoretically lead to a two-fold increase in data rate (i.e., 40 MHz), compared to that attained by a single 20 MHz carrier.

100 164 102 120 180 184 102 164 180 164 The wireless communications systemmay further include a UEthat may communicate with a macro cell base stationover a communication linkand/or the mmW base stationover a mmW communication link. For example, the macro cell base stationmay support a PCell and one or more SCells for the UEand the mmW base stationmay support one or more SCells for the UE.

164 182 102 120 164 182 160 110 102 110 102 102 102 102 In some cases, the UEand the UEmay be capable of sidelink communication. Sidelink-capable UEs (SL-UEs) may communicate with base stationsover communication linksusing the Uu interface (i.e., the air interface between a UE and a base station). SL-UEs (e.g., UE, UE) may also communicate directly with each other over a wireless sidelinkusing the PC5 interface (i.e., the air interface between sidelink-capable UEs). A wireless sidelink (or just “sidelink”) is an adaptation of the core cellular (e.g., LTE, NR) standard that allows direct communication between two or more UEs without the communication needing to go through a base station. Sidelink communication may be unicast or multicast, and may be used for device-to-device (D2D) media-sharing, vehicle-to-vehicle (V2V) communication, vehicle-to-everything (V2X) communication (e.g., cellular V2X (cV2X) communication, enhanced V2X (eV2X) communication, etc.), emergency rescue applications, etc. One or more of a group of SL-UEs utilizing sidelink communications may be within the geographic coverage areaof a base station. Other SL-UEs in such a group may be outside the geographic coverage areaof a base stationor be otherwise unable to receive transmissions from a base station. In some cases, groups of SL-UEs communicating via sidelink communications may utilize a one-to-many (1:M) system in which each SL-UE transmits to every other SL-UE in the group. In some cases, a base stationfacilitates the scheduling of resources for sidelink communications. In other cases, sidelink communications are carried out between SL-UEs without the involvement of a base station.

160 In an aspect, the sidelinkmay operate over a wireless communication medium of interest, which may be shared with other wireless communications between other vehicles and/or infrastructure access points, as well as other RATs. A “medium” may be composed of one or more time, frequency, and/or space communication resources (e.g., encompassing one or more channels across one or more carriers) associated with wireless communication between one or more transmitter/receiver pairs. In an aspect, the medium of interest may correspond to at least a portion of an unlicensed frequency band shared among various RATs. Although different licensed frequency bands have been reserved for certain communication systems (e.g., by a government entity such as the Federal Communications Commission (FCC) in the United States), these systems, in particular those employing small cell access points, have recently extended operation into unlicensed frequency bands such as the Unlicensed National Information Infrastructure (U-NII) band used by wireless local area network (WLAN) technologies, most notably IEEE 802.11x WLAN technologies generally referred to as “Wi-Fi.” Example systems of this type include different variants of CDMA systems, TDMA systems, FDMA systems, orthogonal FDMA (OFDMA) systems, single-carrier FDMA (SC-FDMA) systems, and so on.

1 FIG. 164 182 182 164 104 102 180 102 150 164 182 160 Note that althoughonly illustrates two of the UEs as SL-UEs (i.e., UEsand), any of the illustrated UEs may be SL-UEs. Further, although only UEwas described as being capable of beamforming, any of the illustrated UEs, including UE, may be capable of beamforming. Where SL-UEs are capable of beamforming, they may beamform towards each other (i.e., towards other SL-UEs), towards other UEs (e.g., UEs), towards base stations (e.g., base stations,, small cell′, access point), etc. Thus, in some cases, UEsandmay utilize beamforming over sidelink.

1 FIG. 1 FIG. 104 124 112 112 104 112 104 124 112 102 104 104 124 112 In the example of, any of the illustrated UEs (shown inas a single UEfor simplicity) may receive signalsfrom one or more Earth orbiting space vehicles (SVs)(e.g., satellites). In an aspect, the SVsmay be part of a satellite positioning system that a UEcan use as an independent source of location information. A satellite positioning system typically includes a system of transmitters (e.g., SVs) positioned to enable receivers (e.g., UEs) to determine their location on or above the Earth based, at least in part, on positioning signals (e.g., signals) received from the transmitters. Such a transmitter typically transmits a signal marked with a repeating pseudo-random noise (PN) code of a set number of chips. While typically located in SVs, transmitters may sometimes be located on ground-based control stations, base stations, and/or other UEs. A UEmay include one or more dedicated receivers specifically designed to receive signalsfor deriving geo location information from the SVs.

124 In a satellite positioning system, the use of signalscan be augmented by various satellite-based augmentation systems (SBAS) that may be associated with or otherwise enabled for use with one or more global and/or regional navigation satellite systems. For example an SBAS may include an augmentation system(s) that provides integrity information, differential corrections, etc., such as the Wide Area Augmentation System (WAAS), the European Geostationary Navigation Overlay Service (EGNOS), the Multi-functional Satellite Augmentation System (MSAS), the Global Positioning System (GPS) Aided Geo Augmented Navigation or GPS and Geo Augmented Navigation system (GAGAN), and/or the like. Thus, as used herein, a satellite positioning system may include any combination of one or more global and/or regional navigation satellites associated with such one or more satellite positioning systems.

112 112 102 104 124 112 102 In an aspect, SVsmay additionally or alternatively be part of one or more non-terrestrial networks (NTNs). In an NTN, an SVis connected to an earth station (also referred to as a ground station, NTN gateway, or gateway), which in turn is connected to an element in a 5G network, such as a modified base station(without a terrestrial antenna) or a network node in a 5GC. This element would in turn provide access to other elements in the 5G network and ultimately to entities external to the 5G network, such as Internet web servers and other user devices. In that way, a UEmay receive communication signals (e.g., signals) from an SVinstead of, or in addition to, communication signals from a terrestrial base station.

100 190 190 192 104 102 190 194 152 150 190 192 194 1 FIG. The wireless communications systemmay further include one or more UEs, such as UE, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) links (referred to as “sidelinks”). In the example of, UEhas a D2D P2P linkwith one of the UEsconnected to one of the base stations(e.g., through which UEmay indirectly obtain cellular connectivity) and a D2D P2P linkwith WLAN STAconnected to the WLAN AP(through which UEmay indirectly obtain WLAN-based Internet connectivity). In an example, the D2D P2P linksandmay be supported with any well-known D2D RAT, such as LTE Direct (LTE-D), WI-FI DIRECT®, BLUETOOTH®, and so on.

2 FIG.A 200 210 214 212 213 215 222 210 212 214 224 210 215 214 213 212 224 222 223 220 222 224 222 222 224 204 illustrates an example wireless network structure. For example, a 5GC(also referred to as a Next Generation Core (NGC)) can be viewed functionally as control plane (C-plane) functions(e.g., UE registration, authentication, network access, gateway selection, etc.) and user plane (U-plane) functions, (e.g., UE gateway function, access to data networks, IP routing, etc.) which operate cooperatively to form the core network. User plane interface (NG-U)and control plane interface (NG-C)connect the gNBto the 5GCand specifically to the user plane functionsand control plane functions, respectively. In an additional configuration, an ng-eNBmay also be connected to the 5GCvia NG-Cto the control plane functionsand NG-Uto user plane functions. Further, ng-eNBmay directly communicate with gNBvia a backhaul connection. In some configurations, a Next Generation RAN (NG-RAN)may have one or more gNBs, while other configurations include one or more of both ng-eNBsand gNBs. Either (or both) gNBor ng-eNBmay communicate with one or more UEs(e.g., any of the UEs described herein).

230 210 204 230 230 204 230 210 230 Another optional aspect may include a location server, which may be in communication with the 5GCto provide location assistance for UE(s). The location servercan be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server. The location servercan be configured to support one or more location services for UEsthat can connect to the location servervia the core network, 5GC, and/or via the Internet (not illustrated). Further, the location servermay be integrated into a component of the core network, or alternatively may be external to the core network (e.g., a third party server, such as an original equipment manufacturer (OEM) server or service server).

2 FIG.B 2 FIG.A 240 260 210 264 262 260 264 204 266 204 264 204 204 264 264 264 204 270 230 220 270 204 264 illustrates another example wireless network structure. A 5GC(which may correspond to 5GCin) can be viewed functionally as control plane functions, provided by an access and mobility management function (AMF), and user plane functions, provided by a user plane function (UPF), which operate cooperatively to form the core network (i.e., 5GC). The functions of the AMFinclude registration management, connection management, reachability management, mobility management, lawful interception, transport for session management (SM) messages between one or more UEs(e.g., any of the UEs described herein) and a session management function (SMF), transparent proxy services for routing SM messages, access authentication and access authorization, transport for short message service (SMS) messages between the UEand the short message service function (SMSF) (not shown), and security anchor functionality (SEAF). The AMFalso interacts with an authentication server function (AUSF) (not shown) and the UE, and receives the intermediate key that was established as a result of the UEauthentication process. In the case of authentication based on a UMTS (universal mobile telecommunications system) subscriber identity module (USIM), the AMFretrieves the security material from the AUSF. The functions of the AMFalso include security context management (SCM). The SCM receives a key from the SEAF that it uses to derive access-network specific keys. The functionality of the AMFalso includes location services management for regulatory services, transport for location services messages between the UEand a location management function (LMF)(which acts as a location server), transport for location services messages between the NG-RANand the LMF, evolved packet system (EPS) bearer identifier allocation for interworking with the EPS, and UEmobility event notification. In addition, the AMFalso supports functionalities for non-3GPP® (Third Generation Partnership Project) access networks.

262 262 204 272 Functions of the UPFinclude acting as an anchor point for intra/inter-RAT mobility (when applicable), acting as an external protocol data unit (PDU) session point of interconnect to a data network (not shown), providing packet routing and forwarding, packet inspection, user plane policy rule enforcement (e.g., gating, redirection, traffic steering), lawful interception (user plane collection), traffic usage reporting, quality of service (QoS) handling for the user plane (e.g., uplink/downlink rate enforcement, reflective QoS marking in the downlink), uplink traffic verification (service data flow (SDF) to QoS flow mapping), transport level packet marking in the uplink and downlink, downlink packet buffering and downlink data notification triggering, and sending and forwarding of one or more “end markers” to the source RAN node. The UPFmay also support transfer of location services messages over a user plane between the UEand a location server, such as an SLP.

266 262 266 264 The functions of the SMFinclude session management, UE Internet protocol (IP) address allocation and management, selection and control of user plane functions, configuration of traffic steering at the UPFto route traffic to the proper destination, control of part of policy enforcement and QoS, and downlink data notification. The interface over which the SMFcommunicates with the AMFis referred to as the N11 interface.

270 260 204 270 270 204 270 260 272 270 270 264 220 204 272 204 274 Another optional aspect may include an LMF, which may be in communication with the 5GCto provide location assistance for UEs. The LMFcan be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server. The LMFcan be configured to support one or more location services for UEsthat can connect to the LMFvia the core network, 5GC, and/or via the Internet (not illustrated). The SLPmay support similar functions to the LMF, but whereas the LMFmay communicate with the AMF, NG-RAN, and UEsover a control plane (e.g., using interfaces and protocols intended to convey signaling messages and not voice or data), the SLPmay communicate with UEsand external clients (e.g., third-party server) over a user plane (e.g., using protocols intended to carry voice and/or data like the transmission control protocol (TCP) and/or IP).

274 270 272 260 264 262 220 204 204 274 274 Yet another optional aspect may include a third-party server, which may be in communication with the LMF, the SLP, the 5GC(e.g., via the AMFand/or the UPF), the NG-RAN, and/or the UEto obtain location information (e.g., a location estimate) for the UE. As such, in some cases, the third-party servermay be referred to as a location services (LCS) client or an external client. The third-party servercan be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc.), or alternately may each correspond to a single server.

263 265 260 262 264 222 224 220 222 224 264 222 224 262 222 224 220 223 222 224 204 User plane interfaceand control plane interfaceconnect the 5GC, and specifically the UPFand AMF, respectively, to one or more gNBsand/or ng-eNBsin the NG-RAN. The interface between gNB(s)and/or ng-eNB(s)and the AMFis referred to as the “N2” interface, and the interface between gNB(s)and/or ng-eNB(s)and the UPFis referred to as the “N3” interface. The gNB(s)and/or ng-eNB(s)of the NG-RANmay communicate directly with each other via backhaul connections, referred to as the “Xn-C” interface. One or more of gNBsand/or ng-eNBsmay communicate with one or more UEsover a wireless interface, referred to as the “Uu” interface.

222 226 228 229 226 228 226 222 228 222 226 228 228 232 226 228 222 229 228 229 204 226 228 229 The functionality of a gNBmay be divided between a gNB central unit (gNB-CU), one or more gNB distributed units (gNB-DUs), and one or more gNB radio units (gNB-RUs). A gNB-CUis a logical node that includes the base station functions of transferring user data, mobility control, radio access network sharing, positioning, session management, and the like, except for those functions allocated exclusively to the gNB-DU(s). More specifically, the gNB-CUgenerally host the radio resource control (RRC), service data adaptation protocol (SDAP), and packet data convergence protocol (PDCP) protocols of the gNB. A gNB-DUis a logical node that generally hosts the radio link control (RLC) and medium access control (MAC) layer of the gNB. Its operation is controlled by the gNB-CU. One gNB-DUcan support one or more cells, and one cell is supported by only one gNB-DU. The interfacebetween the gNB-CUand the one or more gNB-DUsis referred to as the “F1” interface. The physical (PHY) layer functionality of a gNBis generally hosted by one or more standalone gNB-RUsthat perform functions such as power amplification and signal transmission/reception. The interface between a gNB-DUand a gNB-RUis referred to as the “Fx” interface. Thus, a UEcommunicates with the gNB-CUvia the RRC, SDAP, and PDCP layers, with a gNB-DUvia the RLC and MAC layers, and with a gNB-RUvia the PHY layer.

Deployment of communication systems, such as 5G NR systems, may be arranged in multiple manners with various components or constituent parts. In a 5G NR system, or network, a network node, a network entity, a mobility element of a network, a RAN node, a core network node, a network element, or a network equipment, such as a base station, or one or more units (or one or more components) performing base station functionality, may be implemented in an aggregated or disaggregated architecture. For example, a base station (such as a Node B (NB), evolved NB (eNB), NR base station, 5G NB, AP, TRP, cell, etc.) may be implemented as an aggregated base station (also known as a standalone base station or a monolithic base station) or a disaggregated base station.

An aggregated base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node. A disaggregated base station may be configured to utilize a protocol stack that is physically or logically distributed among two or more units (such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other RAN nodes. The DUs may be implemented to communicate with one or more RUs. Each of the CU, DU and RU also can be implemented as virtual units, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

Base station-type operation or network design may consider aggregation characteristics of base station functionality. For example, disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN ALLIANCE®)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Disaggregation may include distributing functionality across two or more units at various physical locations, as well as distributing functionality for at least one unit virtually, which can enable flexibility in network design. The various units of the disaggregated base station, or disaggregated RAN architecture, can be configured for wired or wireless communication with at least one other unit.

2 FIG.C 250 250 280 226 267 210 260 267 259 257 255 280 285 228 285 287 229 287 204 204 287 illustrates an example disaggregated base station architecture, according to aspects of the disclosure. The disaggregated base station architecturemay include one or more central units (CUs)(e.g., gNB-CU) that can communicate directly with a core network(e.g., 5GC, 5GC) via a backhaul link, or indirectly with the core networkthrough one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC)via an E2 link, or a Non-Real Time (Non-RT) RICassociated with a Service Management and Orchestration (SMO) Framework, or both). A CUmay communicate with one or more DUs(e.g., gNB-DUs) via respective midhaul links, such as an F1 interface. The DUsmay communicate with one or more radio units (RUs)(e.g., gNB-RUs) via respective fronthaul links. The RUsmay communicate with respective UEsvia one or more radio frequency (RF) access links. In some implementations, the UEmay be simultaneously served by multiple RUs.

280 285 287 259 257 255 Each of the units, i.e., the CUs, the DUs, the RUs, as well as the Near-RT RICs, the Non-RT RICsand the SMO Framework, may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a RF transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.

280 280 280 280 280 285 In some aspects, the CUmay host one or more higher layer control functions. Such control functions can include RRC, PDCP, service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU. The CUmay be configured to handle user plane functionality (i.e., Central Unit-User Plane (CU-UP)), control plane functionality (i.e., Central Unit-Control Plane (CU-CP)), or a combination thereof. In some implementations, the CUcan be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CUcan be implemented to communicate with the DU, as necessary, for network control and signaling.

285 287 285 285 285 280 The DUmay correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs. In some aspects, the DUmay host one or more of a RLC layer, a MAC layer, and one or more high PHY layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3rd Generation Partnership Project (3GPP®). In some aspects, the DUmay further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU, or with the control functions hosted by the CU.

287 287 285 287 204 287 285 285 280 Lower-layer functionality can be implemented by one or more RUs. In some deployments, an RU, controlled by a DU, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like), or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU(s)can be implemented to handle over the air (OTA) communication with one or more UEs. In some implementations, real-time and non-real-time aspects of control and user plane communication with the RU(s)can be controlled by the corresponding DU. In some scenarios, this configuration can enable the DU(s)and the CUto be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

255 255 255 269 280 285 287 259 255 261 255 287 255 257 255 The SMO Frameworkmay be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Frameworkmay be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO Frameworkmay be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud)) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements can include, but are not limited to, CUs, DUs, RUsand Near-RT RICs. In some implementations, the SMO Frameworkcan communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB), via an O1 interface. Additionally, in some implementations, the SMO Frameworkcan communicate directly with one or more RUsvia an O1 interface. The SMO Frameworkalso may include a Non-RT RICconfigured to support functionality of the SMO Framework.

257 259 257 259 259 280 285 259 The Non-RT RICmay be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, artificial intelligence/machine learning (AI/ML) workflows including model training and updates, or policy-based guidance of applications/features in the Near-RT RIC. The Non-RT RICmay be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC. The Near-RT RICmay be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs, one or more DUs, or both, as well as an O-eNB, with the Near-RT RIC.

259 257 259 255 257 257 259 257 255 In some implementations, to generate AI/ML models to be deployed in the Near-RT RIC, the Non-RT RICmay receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RICand may be received at the SMO Frameworkor the Non-RT RICfrom non-network data sources or from network functions. In some examples, the Non-RT RICor the Near-RT RICmay be configured to tune RAN behavior or performance. For example, the Non-RT RICmay monitor long-term trends and patterns for performance and employ AI/ML models to perform corrective actions through the SMO Framework(such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies).

3 3 3 FIGS.A,B, andC 2 2 FIGS.A andB 302 304 306 230 270 220 210 260 illustrate several example components (represented by corresponding blocks) that may be incorporated into a UE(which may correspond to any of the UEs described herein), a base station(which may correspond to any of the base stations described herein), and a network entity(which may correspond to or embody any of the network functions described herein, including the location serverand the LMF, or alternatively may be independent from the NG-RANand/or 5GC/infrastructure depicted in, such as a private network) to support the operations described herein. It will be appreciated that these components may be implemented in different types of apparatuses in different implementations (e.g., in an ASIC, in a system-on-chip (SoC), etc.). The illustrated components may also be incorporated into other apparatuses in a communication system. For example, other apparatuses in a system may include components similar to those described to provide similar functionality. Also, a given apparatus may contain one or more of the components. For example, an apparatus may include multiple transceiver components that enable the apparatus to operate on multiple carriers and/or communicate via different technologies.

302 304 310 350 310 350 316 356 310 350 318 358 318 358 310 350 314 354 318 358 312 352 318 358 The UEand the base stationeach include one or more wireless wide area network (WWAN) transceiversand, respectively, providing means for communicating (e.g., means for transmitting, means for receiving, means for measuring, means for tuning, means for refraining from transmitting, etc.) via one or more wireless communication networks (not shown), such as an NR network, an LTE network, a GSM network, and/or the like. The WWAN transceiversandmay each be connected to one or more antennasand, respectively, for communicating with other network nodes, such as other UEs, access points, base stations (e.g., eNBs, gNBs), etc., via at least one designated RAT (e.g., NR, LTE, GSM, etc.) over a wireless communication medium of interest (e.g., some set of time/frequency resources in a particular frequency spectrum). The WWAN transceiversandmay be variously configured for transmitting and encoding signalsand(e.g., messages, indications, information, and so on), respectively, and, conversely, for receiving and decoding signalsand(e.g., messages, indications, information, pilots, and so on), respectively, in accordance with the designated RAT. Specifically, the WWAN transceiversandinclude one or more transmittersand, respectively, for transmitting and encoding signalsand, respectively, and one or more receiversand, respectively, for receiving and decoding signalsand, respectively.

302 304 320 360 320 360 326 366 320 360 328 368 328 368 320 360 324 364 328 368 322 362 328 368 320 360 The UEand the base stationeach also include, at least in some cases, one or more short-range wireless transceiversand, respectively. The short-range wireless transceiversandmay be connected to one or more antennasand, respectively, and provide means for communicating (e.g., means for transmitting, means for receiving, means for measuring, means for tuning, means for refraining from transmitting, etc.) with other network nodes, such as other UEs, access points, base stations, etc., via at least one designated RAT (e.g., Wi-Fi, LTE Direct, BLUETOOTH®, ZIGBEE®, Z-WAVE®, PC5, dedicated short-range communications (DSRC), wireless access for vehicular environments (WAVE), near-field communication (NFC), ultra-wideband (UWB), etc.) over a wireless communication medium of interest. The short-range wireless transceiversandmay be variously configured for transmitting and encoding signalsand(e.g., messages, indications, information, and so on), respectively, and, conversely, for receiving and decoding signalsand(e.g., messages, indications, information, pilots, and so on), respectively, in accordance with the designated RAT. Specifically, the short-range wireless transceiversandinclude one or more transmittersand, respectively, for transmitting and encoding signalsand, respectively, and one or more receiversand, respectively, for receiving and decoding signalsand, respectively. As specific examples, the short-range wireless transceiversandmay be Wi-Fi transceivers, BLUETOOTH® transceivers, ZIGBEE® and/or Z-WAVE® transceivers, NFC transceivers, UWB transceivers, or vehicle-to-vehicle (V2V) and/or vehicle-to-everything (V2X) transceivers.

302 304 330 370 332 372 334 374 304 112 370 304 370 The UEand the base stationalso include, at least in some cases, satellite signal interfacesand, which each include one or more satellite signal receiversand, respectively, and may optionally include one or more satellite signal transmittersand, respectively. In some cases, the base stationmay be a terrestrial base station that may communicate with space vehicles (e.g., space vehicles) via the satellite signal interface. In other cases, the base stationmay be a space vehicle (or other non-terrestrial entity) that uses the satellite signal interfaceto communicate with terrestrial networks and/or other space vehicles.

332 372 336 376 338 378 332 372 338 378 332 372 338 378 332 372 338 378 332 372 302 304 The satellite signal receiversandmay be connected to one or more antennasand, respectively, and may provide means for receiving and/or measuring satellite positioning/communication signalsand, respectively. Where the satellite signal receiver(s)andare satellite positioning system receivers, the satellite positioning/communication signalsandmay be global positioning system (GPS) signals, global navigation satellite system (GLONASS) signals, Galileo signals, Beidou signals, Indian Regional Navigation Satellite System (NAVIC), Quasi-Zenith Satellite System (QZSS) signals, etc. Where the satellite signal receiver(s)andare non-terrestrial network (NTN) receivers, the satellite positioning/communication signalsandmay be communication signals (e.g., carrying control and/or user data) originating from a 5G network. The satellite signal receiver(s)andmay comprise any suitable hardware and/or software for receiving and processing satellite positioning/communication signalsand, respectively. The satellite signal receiver(s)andmay request information and operations as appropriate from the other systems, and, at least in some cases, perform calculations to determine locations of the UEand the base station, respectively, using measurements obtained by any suitable satellite positioning system algorithm.

334 374 336 376 338 378 374 378 334 374 338 378 334 374 338 378 334 374 The optional satellite signal transmitter(s)and, when present, may be connected to the one or more antennasand, respectively, and may provide means for transmitting satellite positioning/communication signalsand, respectively. Where the satellite signal transmitter(s)are satellite positioning system transmitters, the satellite positioning/communication signalsmay be GPS signals, GLONASS® signals, Galileo signals, Beidou signals, NAVIC, QZSS signals, etc. Where the satellite signal transmitter(s)andare NTN transmitters, the satellite positioning/communication signalsandmay be communication signals (e.g., carrying control and/or user data) originating from a 5G network. The satellite signal transmitter(s)andmay comprise any suitable hardware and/or software for transmitting satellite positioning/communication signalsand, respectively. The satellite signal transmitter(s)andmay request information and operations as appropriate from the other systems.

304 306 380 390 304 306 304 380 304 306 306 390 304 306 The base stationand the network entityeach include one or more network transceiversand, respectively, providing means for communicating (e.g., means for transmitting, means for receiving, etc.) with other network entities (e.g., other base stations, other network entities). For example, the base stationmay employ the one or more network transceiversto communicate with other base stationsor network entitiesover one or more wired or wireless backhaul links. As another example, the network entitymay employ the one or more network transceiversto communicate with one or more base stationover one or more wired or wireless backhaul links, or with other network entitiesover one or more wired or wireless core network interfaces.

314 324 354 364 312 322 352 362 380 390 314 324 354 364 316 326 356 366 302 304 312 322 352 362 316 326 356 366 302 304 316 326 356 366 310 350 320 360 A transceiver may be configured to communicate over a wired or wireless link. A transceiver (whether a wired transceiver or a wireless transceiver) includes transmitter circuitry (e.g., transmitters,,,) and receiver circuitry (e.g., receivers,,,). A transceiver may be an integrated device (e.g., embodying transmitter circuitry and receiver circuitry in a single device) in some implementations, may comprise separate transmitter circuitry and separate receiver circuitry in some implementations, or may be embodied in other ways in other implementations. The transmitter circuitry and receiver circuitry of a wired transceiver (e.g., network transceiversandin some implementations) may be coupled to one or more wired network interface ports. Wireless transmitter circuitry (e.g., transmitters,,,) may include or be coupled to a plurality of antennas (e.g., antennas,,,), such as an antenna array, that permits the respective apparatus (e.g., UE, base station) to perform transmit “beamforming,” as described herein. Similarly, wireless receiver circuitry (e.g., receivers,,,) may include or be coupled to a plurality of antennas (e.g., antennas,,,), such as an antenna array, that permits the respective apparatus (e.g., UE, base station) to perform receive beamforming, as described herein. In an aspect, the transmitter circuitry and receiver circuitry may share the same plurality of antennas (e.g., antennas,,,), such that the respective apparatus can only receive or transmit at a given time, not both at the same time. A wireless transceiver (e.g., WWAN transceiversand, short-range wireless transceiversand) may also include a network listen module (NLM) or the like for performing various measurements.

310 320 350 360 380 390 380 390 302 304 As used herein, the various wireless transceivers (e.g., transceivers,,, and, and network transceiversandin some implementations) and wired transceivers (e.g., network transceiversandin some implementations) may generally be characterized as “a transceiver,” “at least one transceiver,” or “one or more transceivers.” As such, whether a particular transceiver is a wired or wireless transceiver may be inferred from the type of communication performed. For example, backhaul communication between network devices or servers will generally relate to signaling via a wired transceiver, whereas wireless communication between a UE (e.g., UE) and a base station (e.g., base station) will generally relate to signaling via a wireless transceiver.

302 304 306 302 304 306 342 384 394 342 384 394 342 384 394 The UE, the base station, and the network entityalso include other components that may be used in conjunction with the operations as disclosed herein. The UE, the base station, and the network entityinclude one or more processors,, and, respectively, for providing functionality relating to, for example, wireless communication, and for providing other processing functionality. The processors,, andmay therefore provide means for processing, such as means for determining, means for calculating, means for receiving, means for transmitting, means for indicating, etc. In an aspect, the processors,, andmay include, for example, one or more general purpose processors, multi-core processors, central processing units (CPUs), ASICs, digital signal processors (DSPs), field programmable gate arrays (FPGAs), other programmable logic devices or processing circuitry, or various combinations thereof.

302 304 306 340 386 396 340 386 396 302 304 306 348 388 398 348 388 398 342 384 394 302 304 306 348 388 398 342 384 394 348 388 398 340 386 396 342 384 394 302 304 306 348 310 340 342 388 350 386 384 398 390 396 394 3 FIG.A 3 FIG.B 3 FIG.C The UE, the base station, and the network entityinclude memory circuitry implementing memories,, and(e.g., each including a memory device), respectively, for maintaining information (e.g., information indicative of reserved resources, thresholds, parameters, and so on). The memories,, andmay therefore provide means for storing, means for retrieving, means for maintaining, etc. In some cases, the UE, the base station, and the network entitymay include sensing component,, and, respectively. The sensing component,, andmay be hardware circuits that are part of or coupled to the processors,, and, respectively, that, when executed, cause the UE, the base station, and the network entityto perform the functionality described herein. In other aspects, the sensing component,, andmay be external to the processors,, and(e.g., part of a modem processing system, integrated with another processing system, etc.). Alternatively, the sensing component,, andmay be memory modules stored in the memories,, and, respectively, that, when executed by the processors,, and(or a modem processing system, another processing system, etc.), cause the UE, the base station, and the network entityto perform the functionality described herein.illustrates possible locations of the sensing component, which may be, for example, part of the one or more WWAN transceivers, the memory, the one or more processors, or any combination thereof, or may be a standalone component.illustrates possible locations of the sensing component, which may be, for example, part of the one or more WWAN transceivers, the memory, the one or more processors, or any combination thereof, or may be a standalone component.illustrates possible locations of the sensing component, which may be, for example, part of the one or more network transceivers, the memory, the one or more processors, or any combination thereof, or may be a standalone component.

302 344 342 310 320 330 344 344 344 The UEmay include one or more sensorscoupled to the one or more processorsto provide means for sensing or detecting movement and/or orientation information that is independent of motion data derived from signals received by the one or more WWAN transceivers, the one or more short-range wireless transceivers, and/or the satellite signal interface. By way of example, the sensor(s)may include an accelerometer (e.g., a micro-electrical mechanical systems (MEMS) device), a gyroscope, a geomagnetic sensor (e.g., a compass), an altimeter (e.g., a barometric pressure altimeter), and/or any other type of movement detection sensor. Moreover, the sensor(s)may include a plurality of different types of devices and combine their outputs in order to provide motion information. For example, the sensor(s)may use a combination of a multi-axis accelerometer and orientation sensors to provide the ability to compute positions in two-dimensional (2D) and/or three-dimensional (3D) coordinate systems.

302 346 304 306 In addition, the UEincludes a user interfaceproviding means for providing indications (e.g., audible and/or visual indications) to a user and/or for receiving user input (e.g., upon user actuation of a sensing device such a keypad, a touch screen, a microphone, and so on). Although not shown, the base stationand the network entitymay also include user interfaces.

384 306 384 384 384 Referring to the one or more processorsin more detail, in the downlink, IP packets from the network entitymay be provided to the processor. The one or more processorsmay implement functionality for an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The one or more processorsmay provide RRC layer functionality associated with broadcasting of system information (e.g., master information block (MIB), system information blocks (SIBs)), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-RAT mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through automatic repeat request (ARQ), concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, scheduling information reporting, error correction, priority handling, and logical channel prioritization.

354 352 354 302 356 354 The transmitterand the receivermay implement Layer-1 (L1) functionality associated with various signal processing functions. Layer-1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing. The transmitterhandles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an orthogonal frequency division multiplexing (OFDM) subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM symbol stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE. Each spatial stream may then be provided to one or more different antennas. The transmittermay modulate an RF carrier with a respective spatial stream for transmission.

302 312 316 312 342 314 312 312 302 302 312 312 304 304 342 At the UE, the receiverreceives a signal through its respective antenna(s). The receiverrecovers information modulated onto an RF carrier and provides the information to the one or more processors. The transmitterand the receiverimplement Layer-1 functionality associated with various signal processing functions. The receivermay perform spatial processing on the information to recover any spatial streams destined for the UE. If multiple spatial streams are destined for the UE, they may be combined by the receiverinto a single OFDM symbol stream. The receiverthen converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station. These soft decisions may be based on channel estimates computed by a channel estimator. The soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the base stationon the physical channel. The data and control signals are then provided to the one or more processors, which implements Layer-3 (L3) and Layer-2 (L2) functionality.

342 342 In the downlink, the one or more processorsprovides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network. The one or more processorsare also responsible for error detection.

304 342 Similar to the functionality described in connection with the downlink transmission by the base station, the one or more processorsprovides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through hybrid automatic repeat request (HARQ), priority handling, and logical channel prioritization.

304 314 314 316 314 Channel estimates derived by the channel estimator from a reference signal or feedback transmitted by the base stationmay be used by the transmitterto select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the transmittermay be provided to different antenna(s). The transmittermay modulate an RF carrier with a respective spatial stream for transmission.

304 302 352 356 352 384 The uplink transmission is processed at the base stationin a manner similar to that described in connection with the receiver function at the UE. The receiverreceives a signal through its respective antenna(s). The receiverrecovers information modulated onto an RF carrier and provides the information to the one or more processors.

384 302 384 384 In the uplink, the one or more processorsprovides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE. IP packets from the one or more processorsmay be provided to the core network. The one or more processorsare also responsible for error detection.

302 304 306 302 310 320 330 344 304 350 360 370 3 3 3 FIGS.A,B, andC 3 3 FIGS.A toC 3 FIG.A 3 FIG.B For convenience, the UE, the base station, and/or the network entityare shown inas including various components that may be configured according to the various examples described herein. It will be appreciated, however, that the illustrated components may have different functionality in different designs. In particular, various components inare optional in alternative configurations and the various aspects include configurations that may vary due to design choice, costs, use of the device, or other considerations. For example, in case of, a particular implementation of UEmay omit the WWAN transceiver(s)(e.g., a wearable device or tablet computer or personal computer (PC) or laptop may have Wi-Fi and/or BLUETOOTH® capability without cellular capability), or may omit the short-range wireless transceiver(s)(e.g., cellular-only, etc.), or may omit the satellite signal interface, or may omit the sensor(s), and so on. In another example, in case of, a particular implementation of the base stationmay omit the WWAN transceiver(s)(e.g., a Wi-Fi “hotspot” access point without cellular capability), or may omit the short-range wireless transceiver(s)(e.g., cellular-only, etc.), or may omit the satellite signal interface, and so on. For brevity, illustration of the various alternative configurations is not provided herein, but would be readily understandable to one skilled in the art.

302 304 306 308 382 392 308 382 392 302 304 306 304 308 382 392 The various components of the UE, the base station, and the network entitymay be communicatively coupled to each other over data buses,, and, respectively. In an aspect, the data buses,, andmay form, or be part of, a communication interface of the UE, the base station, and the network entity, respectively. For example, where different logical entities are embodied in the same device (e.g., gNB and location server functionality incorporated into the same base station), the data buses,, andmay provide communication between them.

3 3 3 FIGS.A,B, andC 3 3 3 FIGS.A,B, andC 310 346 302 350 388 304 390 398 306 302 304 306 342 384 394 310 320 350 360 340 386 396 348 388 398 The components ofmay be implemented in various ways. In some implementations, the components ofmay be implemented in one or more circuits such as, for example, one or more processors and/or one or more ASICs (which may include one or more processors). Here, each circuit may use and/or incorporate at least one memory component for storing information or executable code used by the circuit to provide this functionality. For example, some or all of the functionality represented by blockstomay be implemented by processor and memory component(s) of the UE(e.g., by execution of appropriate code and/or by appropriate configuration of processor components). Similarly, some or all of the functionality represented by blockstomay be implemented by processor and memory component(s) of the base station(e.g., by execution of appropriate code and/or by appropriate configuration of processor components). Also, some or all of the functionality represented by blockstomay be implemented by processor and memory component(s) of the network entity(e.g., by execution of appropriate code and/or by appropriate configuration of processor components). For simplicity, various operations, acts, and/or functions are described herein as being performed “by a UE,” “by a base station,” “by a network entity,” etc. However, as will be appreciated, such operations, acts, and/or functions may actually be performed by specific components or combinations of components of the UE, base station, network entity, etc., such as the processors,,, the transceivers,,, and, the memories,, and, the sensing component,, and, etc.

306 306 220 210 260 306 302 304 304 In some designs, the network entitymay be implemented as a core network component. In other designs, the network entitymay be distinct from a network operator or operation of the cellular network infrastructure (e.g., NG RANand/or 5GC/). For example, the network entitymay be a component of a private network that may be configured to communicate with the UEvia the base stationor independently from the base station(e.g., over a non-cellular communication link, such as Wi-Fi).

Wireless communication signals (e.g., radio frequency (RF) signals configured to carry orthogonal frequency division multiplexing (OFDM) symbols in accordance with a wireless communications standard, such as LTE, NR, etc.) transmitted between a UE and a base station can be used for environment sensing (also referred to as “RF sensing” or “wireless sensing”). Using wireless communication signals for environment sensing can be regarded as consumer-level wireless sensing with advanced detection capabilities that enable, among other things, touchless/device-free interaction with a device/system. The wireless communication signals may be cellular communication signals, such as LTE or NR signals, WLAN signals, such as Wi-Fi signals, etc. As a particular example, the wireless communication signals may be an OFDM waveform as utilized in LTE and NR. High-frequency communication signals, such as millimeter wave (mmW) RF signals, are especially beneficial to use as sensing signals because the higher frequency provides, at least, more accurate range (distance) detection.

Possible use cases of RF sensing include health monitoring use cases, such as heartbeat detection, respiration rate monitoring, and the like, gesture recognition use cases, such as human activity recognition, keystroke detection, sign language recognition, and the like, contextual information acquisition use cases, such as location detection/tracking, direction finding, range estimation, and the like, and automotive sensing use cases, such as smart cruise control, collision avoidance, and the like.

4 4 FIGS.A andB 4 FIG.A 4 FIG.B 4 FIG.A 400 430 404 404 434 404 434 406 404 436 434 406 There are different types of sensing, including monostatic sensing (also referred to as “active sensing”) and bistatic sensing (also referred to as “passive sensing”).illustrate these different types of sensing. Specifically,is a diagramillustrating a monostatic sensing scenario andis a diagramillustrating a bistatic sensing scenario. In, the transmitter (Tx) and receiver (Rx) are co-located in the same sensing device(e.g., a UE). The sensing devicetransmits one or more RF sensing signals(e.g., uplink or sidelink positioning reference signals (PRS) where the sensing deviceis a UE), and some of the RF sensing signalsreflect off a target object(e.g., an unmanned aerial vehicle (UAV)). The sensing devicecan measure various properties (e.g., times of arrival (ToAs), angles of arrival (AoAs), phase shift, etc.) of the reflectionsof the RF sensing signalsto determine characteristics of the target object(e.g., size, shape, speed, motion state, etc.).

4 FIG.B 4 FIG.B 432 432 402 408 402 408 402 408 408 In, the transmitter (Tx) and receiver (Rx) are not co-located, that is, they are separate devices (e.g., a UE and a base station). Note that whileillustrates using a downlink RF signal as the RF sensing signal, uplink RF signals or sidelink RF signals can also be used as RF sensing signals. In a downlink scenario, as shown, the transmitter deviceis a base station (e.g., a gNB) and the receiver deviceis a UE (e.g., a mobile phone, a V2X-capable vehicle, a roadside unit (RSU), etc.), whereas in an uplink scenario, the transmitter deviceis a UE and the receiver deviceis a base station. Where the transmitter deviceis a base station and the receiver devicea UE, the sensing is referred to as UE-assisted sensing. In UE-assisted sensing, the position of receiver deviceshould be known by the network (e.g., by GPS or other UE positioning method).

4 FIG.B 402 432 434 408 434 406 408 432 402 436 434 406 Referring toin greater detail, the transmitter devicetransmits RF sensing signalsand(e.g., positioning reference signals (PRS)) to the receiver device, but some of the RF sensing signalsreflect off a target object. The receiver device(also referred to as the “sensing device”) can measure the times of arrival (ToAs) of the RF sensing signalsreceived directly from the transmitter deviceand the ToAs of the reflectionsof the RF sensing signalsreflected from the target object.

More specifically, as described above, a transmitter device (e.g., a base station) may transmit a single RF signal or multiple RF signals to a receiver device (e.g., a UE). However, the receiver may receive multiple RF signals corresponding to each transmitted RF signal due to the propagation characteristics of RF signals through multipath channels. Each path may be associated with a cluster of one or more channel taps. Generally, the time at which the receiver detects the first cluster of channel taps is considered the ToA of the RF signal on the line-of-site (LOS) path (i.e., the shortest path between the transmitter and the receiver). Later clusters of channel taps are considered to have reflected off objects between the transmitter and the receiver and therefore to have followed non-LOS (NLOS) paths between the transmitter and the receiver.

4 FIG.B 432 402 408 434 402 408 406 402 432 434 402 432 434 Thus, referring back to, the RF sensing signalsfollowed the LOS path between the transmitter deviceand the receiver device, and the RF sensing signalsfollowed an NLOS path between the transmitter deviceand the receiver devicedue to reflecting off the target object. The transmitter devicemay have transmitted multiple RF sensing signals,, some of which followed the LOS path and others of which followed the NLOS path. Alternatively, the transmitter devicemay have transmitted a single RF sensing signal in a broad enough beam that a portion of the RF sensing signal followed the LOS path (RF sensing signal) and a portion of the RF sensing signal followed the NLOS path (RF sensing signal).

408 408 408 408 406 408 406 408 402 408 402 408 402 406 Based on the ToA of the LOS path, the ToA of the NLOS path, and the speed of light, the receiver devicecan determine the distance to the target object(s). For example, the receiver devicecan calculate the distance to the target object as the difference between the ToA of the LOS path and the ToA of the NLOS path multiplied by the speed of light. In addition, if the receiver deviceis capable of receive beamforming, the receiver devicemay be able to determine the general direction to a target objectas the direction (angle) of the receive beam on which the RF sensing signal following the NLOS path was received. That is, the receiver devicemay determine the direction to the target objectas the AoA of the RF sensing signal, which is the angle of the receive beam used to receive the RF sensing signal. The receiver devicemay then optionally report this information to the transmitter device, its serving base station, an application server associated with the core network, an external client, a third-party application, or some other sensing entity. Alternatively, the receiver devicemay report the ToA measurements to the transmitter device, or other sensing entity (e.g., if the receiver devicedoes not have the processing capability to perform the calculations itself), and the transmitter devicemay determine the distance and, optionally, the direction to the target object.

Note that if the RF sensing signals are uplink RF signals transmitted by a UE to a base station, the base station would perform object detection based on the uplink RF signals just like the UE does based on the downlink RF signals.

Like conventional wireless sensing, wireless communication-based sensing signals can be used to estimate the range (distance), velocity (Doppler), and angle (AoA) of a target object. However, the performance (e.g., resolution and maximum values of range, velocity, and angle) may depend on the design of the reference signal.

5 5 FIGS.A toF 5 FIG.A 5 FIG.B 5 FIG.C 5 FIG.D 5 FIG.E 5 FIG.F 1 1 500 1 1 510 1 2 520 1 1 530 1 1 540 1 2 550 illustrate various example monostatic and bistatic sensing use cases, according to aspects of the disclosure. In, a gNB-to-gNBmonostatic sensing use caseis depicted. In, a UE-to-UEmonostatic sensing use caseis depicted. In, a gNB-to-gNBbistatic sensing use caseis depicted. In, a gNB-to-UEbistatic sensing use caseis depicted. In, a UE-to-gNBbistatic sensing use caseis depicted. In, a UE-to-UEbistatic sensing use caseis depicted.

6 FIG. 6 FIG. 600 illustrates an example call flowfor an NR-based sensing procedure (e.g., a bistatic sensing procedure) in which the network configures the sensing parameters, according to aspects of the disclosure. Althoughillustrates a network-coordinated sensing procedure, the sensing procedure could be coordinated over sidelink channels.

605 670 622 604 604 610 622 670 615 670 604 620 604 670 At stage, a sensing server(e.g., inside or outside the core network) sends a request for network (NW) information to a gNB(e.g., the serving gNB of a UE). The request may be for a list of the UE'sserving cell and any neighboring cells. At stage, the gNBsends the requested information to the sensing server. At stage, the sensing serversends a request for sensing capabilities to the UE. At stage, the UEprovides its sensing capabilities to the sensing server.

625 670 604 610 6 FIG. At stage, the sensing serversends a configuration to the UEindicating one or more reference signal (RS) resources that will be transmitted for sensing. The reference signal resources may be transmitted by the serving and/or neighboring cells identified at stage. In some cases, the NR-based sensing procedure illustrated inmay be a sensing-only procedure or a joint communication and sensing (JCS) procedure. In the case of a sensing-only procedure, the reference signal resources may be reference signal resources specifically configured for sensing purposes. In the case of a JCS procedure, the reference signal resources may be reference signal resources for communication that can also be used for sensing purposes. Alternatively, the reference signal resources for sensing may be multiplexed (e.g., time-division multiplexed) with reference signal resources for communication. For example, the reference signal resources for communication may be an orthogonal frequency division multiplexing (OFDM) waveform, while the reference signal resources for sensing may be a frequency modulation continuous wave (FMCW) waveform.

630 670 604 604 635 670 At stage, the sensing serversends a request for sensing information to the UE. The UEthen measures the transmitted reference signals and, at stage, sends the measurements, or any sensing results determined from the measurements, to the sensing server.

604 670 670 In an aspect, the communication between the UEand the sensing servermay be via the LTE positioning protocol (LPP). The communication between the sensing serverand the gNB may be via NR positioning protocol type A (NRPPa).

270 The concept of a positioning reference unit (PRU) has been introduced in 5G NR for UE positioning error calibration. As defined for LPP, a PRU at a known location can perform positioning measurements (e.g., RSRP, reference signal time difference (RSTD), UE reception-to-transmission (Rx-Tx) time difference, etc.) and report these measurements to a location server (e.g., LMF). In addition, a PRU can transmit SRS to enable TRPs to measure and report uplink positioning measurements (e.g., relative time of arrival (RTOA), uplink angle-of-arrival (UL-AoA), gNB Rx-Tx time difference, etc.) from a PRU at a known location. The PRU measurements can be compared by a location server with the measurements expected at the known PRU location to determine correction terms for other nearby target devices. The downlink and/or uplink location measurements for other target devices can then be corrected based on the previously determined correction terms. From a location server perspective, the PRU functionality is realized by a UE with a known location.

5 FIG.D 5 FIG.E 5 FIG.F For RF sensing, including bistatic RF sensing, such as gNB-to-UE bistatic sensing (e.g., as in), UE-to-gNB bistatic sensing (e.g., as in), and UE-to-UE bistatic sensing (e.g., as in), the location of the UE is assumed to be known. Thus, for network-based bistatic RF sensing, the sensing server (e.g., a sensing management function (SnMF)) not only needs to receive the sensing measurement report from the UE, but also needs to obtain the real-time location of the UE. This can result in high signaling overhead, since many UEs are mobile devices. The real-time UE location estimation may also demand high resource overhead (if the location estimation uses cellular-based positioning) and processing at the UE.

Further, the accuracy of the UE location can greatly impact the performance of the bistatic RF sensing. In addition, RF impairment at the UE may also impact the performance of the bistatic RF sensing.

In view of the above observations, the present disclosure provides techniques to utilize PRUs for cellular-based RF sensing. At a high level, the present disclosure provides techniques for using one or more PRUs for RF sensing calibration purposes for downlink-based and/or uplink-based RF sensing. In some cases, the RF sensing calibration may be triggered using one or more PRUs. The present disclosure further provides techniques for PRU-aided RF sensing.

Note that a PRU configured to perform the techniques described herein may be referred to generically as a “reference sensing node” or a “sensing reference node.” In some cases, such a PRU may also or alternatively be referred to as a “sensing reference unit” (SRU).

436 Referring to using one or more PRUs for RF sensing calibration purposes, in some cases, a PRU may serve as a target emulator to generate echo signals (e.g., reflections) with particular target properties. In such cases, the PRU may be configured to receive a downlink sensing reference signal from a base station (or base station component) and re-generate a modified downlink sensing reference signal with the following emulated/simulated target properties: (1) radar cross section (RCS) and/or (2) Doppler and/or micro Doppler.

620 604 625 604 6 FIG. 6 FIG. The PRU may be configured to transmit the modified sensing reference signal with a specific Rx-Tx time difference. Here, the Rx-Tx time difference is the difference between the reception time of the downlink sensing reference signal from the transmitter sensing node (i.e., the base station or base station component) and the transmission time of the modified downlink sensing reference signal. The PRU may report the Rx-Tx time difference it supports as a capability to the network (e.g., at stageof, where the UEis the PRU). The network may indicate the configured Rx-Tx time difference to the UE (or other receiver sensing node) that is using the PRU for RF sensing calibration (e.g., at stageof, where the UEis the receiver sensing node). This enables the UE to adjust its search window to efficiently search for and receive the modified sensing reference signal.

635 604 432 436 406 6 FIG. The UE may report the RF sensing results related to the PRU generated/emulated/simulated “target” (e.g., at stageof, where the UEis the receiver sensing node). In some cases, the UE may remove the group delay introduced by the Rx-Tx time difference at the PRU (based on the pre-configured knowledge of the Rx-Tx time difference). The sensing measurements may be (1) the RSTD between the line-of-sight (LOS) path (e.g., followed by RF sensing signals) and the PRU generated “target” (e.g., reflection, where the targetis the PRU), (2) the angle-of-arrival (AoA) of the PRU generated “target,” (3) the Doppler measurement of the PRU generated “target,” and/or (4) the RCS of the PRU generated “target.” In some cases, the UE may report that it is not able to detect the PRU generated “target.”

A similar procedure can be applied for uplink-based RF sensing. In this case, a PRU may be configured to receive an uplink sensing reference signal from a nearby UE, then re-generate a modified uplink sensing reference signal having certain configured target properties (e.g., RCS, Doppler, micro Doppler).

620 604 6 FIG. The PRU may be configured to transmit the modified uplink sensing reference signal with a specific Rx-Tx time difference. Here, the Rx-Tx time difference is the difference between the reception time of the uplink sensing reference signal from the transmitter sensing node (i.e., the UE) and the transmission time of the modified uplink sensing reference signal. The PRU may report the Rx-Tx time difference it supports as a capability to the network (e.g., at stageof, where the UEis the PRU). The network may indicate the configured Rx-Tx time difference to the base station (or base station component) that is using the PRU for RF sensing calibration. This enables the base station to adjust its search window to efficiently search for and receive the modified uplink sensing reference signal.

The base station may report the RF sensing results related to the PRU generated/emulated/simulated “target.” In some cases, the base station may remove the group delay introduced by the Rx-Tx time difference at the PRU (based on the pre-configured knowledge of the Rx-Tx time difference). The sensing measurements may be (1) the RSTD between the line-of-sight (LOS) path and the PRU generated “target,” (2) the AoA of the PRU generated “target,” (3) the Doppler measurement of the PRU generated “target,” and/or (4) the RCS of the PRU generated “target.” In some cases, the base station may report that it is not able to detect the PRU generated “target.”

In some cases, a PRU may have advanced capabilities to generate target echo signals with on-demand features. For example, the on-demand features may be a time sequence of “RCS, AoA/AoD, Doppler, range” and/or a specific type of target, such as a human, a vehicle, an unmanned aerial vehicle (UAV), etc. In some cases, for such an advanced PRU, the PRU may use generative artificial intelligence (AI) to generate such on-demand features. If an advanced PRU is available, the UE or base station or sensing server may on-demand request the PRU to generate specific target features.

As will be appreciated, the foregoing techniques are equally applicable to sidelink-based RF sensing.

7 FIG. 7 FIG. 700 is a diagramillustrating an example scenario of using a PRU for RF sensing calibration, according to aspects of the disclosure. In the example of, the transmitter sensing node (labeled “Tx”) may be a base station or base station component for downlink-based RF sensing or a UE for uplink-based or sidelink-based RF sensing. The receiver sensing node (labeled “Rx”) may be a base station or base station component for uplink-based RF sensing or a UE for downlink-based or sidelink-based RF sensing. The sensing reference signal (labeled “S-RS”) may be a downlink sensing reference signal (e.g., DL-PRS) for downlink-based RF sensing, an uplink sensing reference signal (e.g., SRS) for uplink-based RF sensing, or a sidelink sensing reference signal (e.g., SL-PRS) for sidelink-based RF sensing.

The location of the PRU is known. Thus, to perform the calibration, the receiver sensing node can estimate the location of the PRU using the received modified sensing reference signal and compare the sensing results (e.g., the measured location of the PRU) with the known PRU location. Any difference between the estimated location of the PRU and the actual/known location of the PRU is the calibration result and can be used to adjust other sensing results obtained by the receiver sensing node.

Referring now to PRU-aided RF sensing, two use cases are considered. As a first use case, a PRU may act as the trigger to perform RF sensing. In this case, one or more PRUs may be deployed in some specific area. The PRU(s) may continuously or periodically monitor the always-on signal(s) transmitted by a base station (e.g., SSBs). Once the PRU(s) detect a target object, it/they may “wake up” other nearby sensing nodes (e.g., UEs) for the next phase of RF sensing. As a first option, a PRU may periodically report the sensing results to the network, in which case, the network may page nearby UEs to wake them up for the next phase of RF sensing. As a second option, a PRU may send a sensing wake up signal directly to one or more nearby UEs using resources in a sidelink resource pool.

As a second use case, a PRU may be used for coverage enhancement for cellular-based RF sensing. In this case, a PRU deployed at the cell edge may be used to enhance the coverage of cellular-based RF sensing. There are multiple reasons to deploy PRUs for cell edge coverage enhancement, including, for example, that (1) PRU locations are typically surveyed with the LOS from the base station to the UE and/or (2) PRU locations are generally fixed, which is much easier with respect to network management. Note that, for an RF sensing PRU, the monitoring space/sensing area should be more open in order to experience minimal impact from clutter.

8 FIG. 8 FIG. 800 is a diagramillustrating an example scenario of using a PRU for coverage enhancement for cellular-based RF sensing, according to aspects of the disclosure. As shown in, two UEs located in a cell edge region (e.g., a region where the signal strength from the base station may be lower than a threshold but handover has not been triggered) are performing a bistatic sensing procedure with a PRU (which may or may not be in the cell edge region) as the target object.

Referring now to using a PRU to trigger RF sensing calibration, two use cases are considered. As a first use case, a PRU may be used for initialization of bistatic sensing setup. In this case, when a UE is configured to perform bistatic sensing, the UE may be configured to use one or more PRUs for RF sensing calibration, as described above. Here, the RF sensing calibration may include calibrating range, Doppler, angle, etc.

As a second use case, a PRU may be used for calibration if inaccurate bistatic sensing results are observed by the sensing server. In this case, after the sensing sever receives the sensing reports from more than one sensing node (e.g., UE), the sensing sever may trigger one or more UEs to perform RF sensing calibration using one or more PRUs, as described above. The sensing reports from the one or more UEs may include one or more of the following: (1) a range error exceeds a threshold, (2) a Doppler error exceeds a threshold, and/or (3) an angle error exceeds a threshold.

9 FIG. 900 900 illustrates an example methodof wireless sensing, according to aspects of the disclosure. In an aspect, methodmay be performed by a reference sensing node (e.g., any of the PRUs or SRUs described herein).

910 At operation, the reference sensing node may receive a sensing reference signal from a transmitter sensing node (e.g., a UE, a base station, or base station component), where the sensing reference signal is configured according to a first set of parameters.

910 310 320 342 340 348 In an aspect, where the reference sensing node is a UE, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

920 At operation, the reference sensing node may transmit, to a receiver sensing node, a modified version of the sensing reference signal, where the modified version of the sensing reference signal is configured according to a second set of parameters, and where the modified version of the sensing reference signal is transmitted according to a configured Rx-Tx time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

920 310 320 342 340 348 In an aspect, where the reference sensing node is a UE, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

10 FIG. 1000 1000 illustrates an example methodof wireless sensing, according to aspects of the disclosure. In an aspect, methodmay be performed by a receiver sensing node (e.g., any of the UEs, base stations, or base station components described herein).

1010 At operation, the receiver sensing node may receive a sensing reference signal from a transmitter sensing node (e.g., a UE, a base station, or base station component), the sensing reference signal configured according to a first set of parameters.

1010 310 320 342 340 348 In an aspect, where the receiver sensing node is a UE, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

1010 350 360 380 384 386 388 In an aspect, where the receiver sensing node is a base station or base station component, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more network transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

1020 At operation, the receiver sensing node may receive, from a reference sensing node (e.g., a PRU or SRU), a modified version of the sensing reference signal, where the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and where the modified version of the sensing reference signal is transmitted after a configured Rx-Tx time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

1020 310 320 342 340 348 In an aspect, where the receiver sensing node is a UE, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

1020 350 360 380 384 386 388 In an aspect, where the receiver sensing node is a base station or base station component, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more network transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

900 1000 As will be appreciated, a technical advantage of the methodsandis enabling calibration of RF sensing using the reference sensing node.

11 FIG. 1100 1100 illustrates an example methodof wireless sensing, according to aspects of the disclosure. In an aspect, methodmay be performed by a reference sensing node (e.g., any of the PRUs or SRUs described herein).

1110 At operation, the reference sensing node may receive, from a network node, one or more repetitions of a periodically transmitted reference signal (e.g., an SSB).

1110 310 320 342 340 348 In an aspect, where the reference sensing node is a UE, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

1120 At operation, the reference sensing node may transmit, to one or more receiver sensing nodes (e.g., one or more UEs, one or more base stations or base station components, or a combination thereof), a wakeup signal based on detection of a target object, where the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

1120 310 320 342 340 348 In an aspect, where the reference sensing node is a UE, operationmay be performed by the one or more WWAN transceivers, the one or more short-range wireless transceivers, the one or more processors, memory, and/or sensing component, any or all of which may be considered means for performing this operation.

1100 As will be appreciated, a technical advantage of the methodis triggering RF sensing using the reference sensing node, thereby reducing resource utilization at the receiver sensing node.

In the detailed description above it can be seen that different features are grouped together in examples. This manner of disclosure should not be understood as an intention that the example clauses have more features than are explicitly mentioned in each clause. Rather, the various aspects of the disclosure may include fewer than all features of an individual example clause disclosed. Therefore, the following clauses should hereby be deemed to be incorporated in the description, wherein each clause by itself can stand as a separate example. Although each dependent clause can refer in the clauses to a specific combination with one of the other clauses, the aspect(s) of that dependent clause are not limited to the specific combination. It will be appreciated that other example clauses can also include a combination of the dependent clause aspect(s) with the subject matter of any other dependent clause or independent clause or a combination of any feature with other dependent and independent clauses. The various aspects disclosed herein expressly include these combinations, unless it is explicitly expressed or can be readily inferred that a specific combination is not intended (e.g., contradictory aspects, such as defining an element as both an electrical insulator and an electrical conductor). Furthermore, it is also intended that aspects of a clause can be included in any other independent clause, even if the clause is not directly dependent on the independent clause.

Implementation examples are described in the following numbered clauses:

Clause 1. A method of wireless sensing performed by a reference sensing node, comprising: receiving a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and transmitting, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 2. The method of clause 1, wherein the second set of parameters indicate one or more properties of a target object.

Clause 3. The method of clause 2, wherein the one or more properties of the target object indicated by the second set of parameters of the modified version of the sensing reference signal include: a radar cross section (RCS) of the target object, a Doppler of the target object, a micro Doppler of the target object, a range of the target object, an angle of the target object, a type of the target object, or any combination thereof.

Clause 4. The method of any of clauses 2 to 3, further comprising: receiving a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 5. The method of clause 4, wherein the request is received from: a sensing server, or the receiver sensing node.

Clause 6. The method of any of clauses 2 to 5, wherein transmission of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 7. The method of any of clauses 1 to 6, wherein the reference sensing node is deployed at a cell edge.

Clause 8. The method of any of clauses 1 to 7, wherein: the transmitter sensing node is a base station or a component of the base station, and the sensing reference signal is a downlink reference signal.

Clause 9. The method of any of clauses 1 to 8, wherein: the transmitter sensing node is a user equipment (UE), and the sensing reference signal is an uplink reference signal.

Clause 10. The method of any of clauses 1 to 9, further comprising: transmitting, to a sensing entity, one or more capabilities of the reference sensing node, the one or more capabilities of the reference sensing node including one or more Rx-Tx time difference values supported by the reference sensing node.

Clause 11. The method of any of clauses 1 to 10, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 12. A method of wireless sensing performed by a receiver sensing node, comprising: receiving a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and receiving, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 13. The method of clause 12, further comprising: performing one or more calibration operations based on reception of the sensing reference signal and the modified version of the sensing reference signal.

Clause 14. The method of any of clauses 12 to 13, further comprising: receiving the Rx-Tx time difference from a sensing server, a serving base station, or the reference sensing node.

Clause 15. The method of any of clauses 12 to 14, further comprising: transmitting a sensing report including one or more sensing results associated with the modified version of the sensing reference signal.

Clause 16. The method of clause 15, wherein the one or more sensing results include: a reference signal time difference (RSTD) measurement between a reception time of the sensing reference signal and the modified version of the sensing reference signal, an angle of the target object determined based on the modified version of the sensing reference signal, a Doppler measurement of the target object determined based on the modified version of the sensing reference signal, a radar cross section (RCS) of the target object determined based on the modified version of the sensing reference signal, or any combination thereof.

Clause 17. The method of any of clauses 12 to 16, further comprising: transmitting a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 18. The method of any of clauses 12 to 17, wherein reception of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 19. The method of any of clauses 12 to 18, wherein: the transmitter sensing node is a base station or a component of the base station, the receiver sensing node is a user equipment (UE), and the sensing reference signal is a downlink reference signal.

Clause 20. The method of any of clauses 12 to 19, wherein: the transmitter sensing node is a user equipment (UE), the receiver sensing node is a base station or a component of the base station; and the sensing reference signal is an uplink reference signal.

Clause 21. The method of any of clauses 12 to 20, wherein: the transmitter sensing node is a first user equipment (UE), the receiver sensing node is a second UE, and the sensing reference signal is a sidelink reference signal.

Clause 22. The method of any of clauses 12 to 21, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 23. A method of wireless sensing performed by a reference sensing node, comprising: receiving, from a network node, one or more repetitions of a periodically transmitted reference signal; and transmitting, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 24. The method of clause 23, further comprising: transmitting, to a sensing server, one or more sensing results reports based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 25. The method of any of clauses 23 to 24, wherein the periodically transmitted reference signal comprises: a tracking reference signal (TRS), a synchronization signal block (SSB), or a channel state information reference signal (CSI-RS).

Clause 26. The method of any of clauses 23 to 25, wherein the one or more receiver sensing nodes are one or more user equipments (UEs).

Clause 27. The method of any of clauses 23 to 26, wherein the network node is a base station or a component of the base station.

Clause 28. The method of any of clauses 23 to 27, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 29. A reference sensing node, comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and transmit, via the one or more transceivers, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 30. The reference sensing node of clause 29, wherein the second set of parameters indicate one or more properties of a target object.

Clause 31. The reference sensing node of clause 30, wherein the one or more properties of the target object indicated by the second set of parameters of the modified version of the sensing reference signal include: a radar cross section (RCS) of the target object, a Doppler of the target object, a micro Doppler of the target object, a range of the target object, an angle of the target object, a type of the target object, or any combination thereof.

Clause 32. The reference sensing node of any of clauses 30 to 31, wherein the one or more processors, either alone or in combination, are further configured to: receive, via the one or more transceivers, a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 33. The reference sensing node of clause 32, wherein the request is received from: a sensing server, or the receiver sensing node.

Clause 34. The reference sensing node of any of clauses 30 to 33, wherein transmission of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 35. The reference sensing node of any of clauses 29 to 34, wherein the reference sensing node is deployed at a cell edge.

Clause 36. The reference sensing node of any of clauses 29 to 35, wherein: the transmitter sensing node is a base station or a component of the base station, and the sensing reference signal is a downlink reference signal.

Clause 37. The reference sensing node of any of clauses 29 to 36, wherein: the transmitter sensing node is a user equipment (UE), and the sensing reference signal is an uplink reference signal.

Clause 38. The reference sensing node of any of clauses 29 to 37, wherein the one or more processors, either alone or in combination, are further configured to: transmit, via the one or more transceivers, to a sensing entity, one or more capabilities of the reference sensing node, the one or more capabilities of the reference sensing node including one or more Rx-Tx time difference values supported by the reference sensing node.

Clause 39. The reference sensing node of any of clauses 29 to 38, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 40. A receiver sensing node, comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and receive, via the one or more transceivers, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 41. The receiver sensing node of clause 40, wherein the one or more processors, either alone or in combination, are further configured to: perform one or more calibration operations based on reception of the sensing reference signal and the modified version of the sensing reference signal.

Clause 42. The receiver sensing node of any of clauses 40 to 41, wherein the one or more processors, either alone or in combination, are further configured to: receive, via the one or more transceivers, the Rx-Tx time difference from a sensing server, a serving base station, or the reference sensing node.

Clause 43. The receiver sensing node of any of clauses 40 to 42, wherein the one or more processors, either alone or in combination, are further configured to: transmit, via the one or more transceivers, a sensing report including one or more sensing results associated with the modified version of the sensing reference signal.

Clause 44. The receiver sensing node of clause 43, wherein the one or more sensing results include: a reference signal time difference (RSTD) measurement between a reception time of the sensing reference signal and the modified version of the sensing reference signal, an angle of the target object determined based on the modified version of the sensing reference signal, a Doppler measurement of the target object determined based on the modified version of the sensing reference signal, a radar cross section (RCS) of the target object determined based on the modified version of the sensing reference signal, or any combination thereof.

Clause 45. The receiver sensing node of any of clauses 40 to 44, wherein the one or more processors, either alone or in combination, are further configured to: transmit, via the one or more transceivers, a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 46. The receiver sensing node of any of clauses 40 to 45, wherein reception of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 47. The receiver sensing node of any of clauses 40 to 46, wherein: the transmitter sensing node is a base station or a component of the base station, the receiver sensing node is a user equipment (UE), and the sensing reference signal is a downlink reference signal.

Clause 48. The receiver sensing node of any of clauses 40 to 47, wherein: the transmitter sensing node is a user equipment (UE), the receiver sensing node is a base station or a component of the base station; and the sensing reference signal is an uplink reference signal.

Clause 49. The receiver sensing node of any of clauses 40 to 48, wherein: the transmitter sensing node is a first user equipment (UE), the receiver sensing node is a second UE, and the sensing reference signal is a sidelink reference signal.

Clause 50. The receiver sensing node of any of clauses 40 to 49, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 51. A reference sensing node, comprising: one or more memories; one or more transceivers; and one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to: receive, via the one or more transceivers, from a network node, one or more repetitions of a periodically transmitted reference signal; and transmit, via the one or more transceivers, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 52. The reference sensing node of clause 51, wherein the one or more processors, either alone or in combination, are further configured to: transmit, via the one or more transceivers, to a sensing server, one or more sensing results reports based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 53. The reference sensing node of any of clauses 51 to 52, wherein the periodically transmitted reference signal comprises: a tracking reference signal (TRS), a synchronization signal block (SSB), or a channel state information reference signal (CSI-RS).

Clause 54. The reference sensing node of any of clauses 51 to 53, wherein the one or more receiver sensing nodes are one or more user equipments (UEs).

Clause 55. The reference sensing node of any of clauses 51 to 54, wherein the network node is a base station or a component of the base station.

Clause 56. The reference sensing node of any of clauses 51 to 55, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 57. A reference sensing node, comprising: means for receiving a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and means for transmitting, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 58. The reference sensing node of clause 57, wherein the second set of parameters indicate one or more properties of a target object.

Clause 59. The reference sensing node of clause 58, wherein the one or more properties of the target object indicated by the second set of parameters of the modified version of the sensing reference signal include: a radar cross section (RCS) of the target object, a Doppler of the target object, a micro Doppler of the target object, a range of the target object, an angle of the target object, a type of the target object, or any combination thereof.

Clause 60. The reference sensing node of any of clauses 58 to 59, further comprising: means for receiving a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 61. The reference sensing node of clause 60, wherein the request is received from: a sensing server, or the receiver sensing node.

Clause 62. The reference sensing node of any of clauses 58 to 61, wherein transmission of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 63. The reference sensing node of any of clauses 57 to 62, wherein the reference sensing node is deployed at a cell edge.

Clause 64. The reference sensing node of any of clauses 57 to 63, wherein: the transmitter sensing node is a base station or a component of the base station, and the sensing reference signal is a downlink reference signal.

Clause 65. The reference sensing node of any of clauses 57 to 64, wherein: the transmitter sensing node is a user equipment (UE), and the sensing reference signal is an uplink reference signal.

Clause 66. The reference sensing node of any of clauses 57 to 65, further comprising: means for transmitting, to a sensing entity, one or more capabilities of the reference sensing node, the one or more capabilities of the reference sensing node including one or more Rx-Tx time difference values supported by the reference sensing node.

Clause 67. The reference sensing node of any of clauses 57 to 66, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 68. A receiver sensing node, comprising: means for receiving a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and means for receiving, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 69. The receiver sensing node of clause 68, further comprising: means for performing one or more calibration operations based on reception of the sensing reference signal and the modified version of the sensing reference signal.

Clause 70. The receiver sensing node of any of clauses 68 to 69, further comprising: means for receiving the Rx-Tx time difference from a sensing server, a serving base station, or the reference sensing node.

Clause 71. The receiver sensing node of any of clauses 68 to 70, further comprising: means for transmitting a sensing report including one or more sensing results associated with the modified version of the sensing reference signal.

Clause 72. The receiver sensing node of clause 71, wherein the one or more sensing results include: a reference signal time difference (RSTD) measurement between a reception time of the sensing reference signal and the modified version of the sensing reference signal, an angle of the target object determined based on the modified version of the sensing reference signal, a Doppler measurement of the target object determined based on the modified version of the sensing reference signal, a radar cross section (RCS) of the target object determined based on the modified version of the sensing reference signal, or any combination thereof.

Clause 73. The receiver sensing node of any of clauses 68 to 72, further comprising: means for transmitting a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 74. The receiver sensing node of any of clauses 68 to 73, wherein reception of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 75. The receiver sensing node of any of clauses 68 to 74, wherein: the transmitter sensing node is a base station or a component of the base station, the receiver sensing node is a user equipment (UE), and the sensing reference signal is a downlink reference signal.

Clause 76. The receiver sensing node of any of clauses 68 to 75, wherein: the transmitter sensing node is a user equipment (UE), the receiver sensing node is a base station or a component of the base station; and the sensing reference signal is an uplink reference signal.

Clause 77. The receiver sensing node of any of clauses 68 to 76, wherein: the transmitter sensing node is a first user equipment (UE), the receiver sensing node is a second UE, and the sensing reference signal is a sidelink reference signal.

Clause 78. The receiver sensing node of any of clauses 68 to 77, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 79. A reference sensing node, comprising: means for receiving, from a network node, one or more repetitions of a periodically transmitted reference signal; and means for transmitting, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 80. The reference sensing node of clause 79, further comprising: means for transmitting, to a sensing server, one or more sensing results reports based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 81. The reference sensing node of any of clauses 79 to 80, wherein the periodically transmitted reference signal comprises: a tracking reference signal (TRS), a synchronization signal block (SSB), or a channel state information reference signal (CSI-RS).

Clause 82. The reference sensing node of any of clauses 79 to 81, wherein the one or more receiver sensing nodes are one or more user equipments (UEs).

Clause 83. The reference sensing node of any of clauses 79 to 82, wherein the network node is a base station or a component of the base station.

Clause 84. The reference sensing node of any of clauses 79 to 83, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 85. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a reference sensing node, cause the reference sensing node to: receive a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters; and transmit, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 86. The non-transitory computer-readable medium of clause 85, wherein the second set of parameters indicate one or more properties of a target object.

Clause 87. The non-transitory computer-readable medium of clause 86, wherein the one or more properties of the target object indicated by the second set of parameters of the modified version of the sensing reference signal include: a radar cross section (RCS) of the target object, a Doppler of the target object, a micro Doppler of the target object, a range of the target object, an angle of the target object, a type of the target object, or any combination thereof.

Clause 88. The non-transitory computer-readable medium of any of clauses 86 to 87, further comprising computer-executable instructions that, when executed by the reference sensing node, cause the reference sensing node to: receive a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 89. The non-transitory computer-readable medium of clause 88, wherein the request is received from: a sensing server, or the receiver sensing node.

Clause 90. The non-transitory computer-readable medium of any of clauses 86 to 89, wherein transmission of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 91. The non-transitory computer-readable medium of any of clauses 85 to 90, wherein the reference sensing node is deployed at a cell edge.

Clause 92. The non-transitory computer-readable medium of any of clauses 85 to 91, wherein: the transmitter sensing node is a base station or a component of the base station, and the sensing reference signal is a downlink reference signal.

Clause 93. The non-transitory computer-readable medium of any of clauses 85 to 92, wherein: the transmitter sensing node is a user equipment (UE), and the sensing reference signal is an uplink reference signal.

Clause 94. The non-transitory computer-readable medium of any of clauses 85 to 93, further comprising computer-executable instructions that, when executed by the reference sensing node, cause the reference sensing node to: transmit, to a sensing entity, one or more capabilities of the reference sensing node, the one or more capabilities of the reference sensing node including one or more Rx-Tx time difference values supported by the reference sensing node.

Clause 95. The non-transitory computer-readable medium of any of clauses 85 to 94, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 96. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a receiver sensing node, cause the receiver sensing node to: receive a sensing reference signal from a transmitter sensing node, the sensing reference signal configured according to a first set of parameters; and receive, from a reference sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters that indicate one or more properties of a target object, and wherein the modified version of the sensing reference signal is transmitted after a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.

Clause 97. The non-transitory computer-readable medium of clause 96, further comprising computer-executable instructions that, when executed by the receiver sensing node, cause the receiver sensing node to: perform one or more calibration operations based on reception of the sensing reference signal and the modified version of the sensing reference signal.

Clause 98. The non-transitory computer-readable medium of any of clauses 96 to 97, further comprising computer-executable instructions that, when executed by the receiver sensing node, cause the receiver sensing node to: receive the Rx-Tx time difference from a sensing server, a serving base station, or the reference sensing node.

Clause 99. The non-transitory computer-readable medium of any of clauses 96 to 98, further comprising computer-executable instructions that, when executed by the receiver sensing node, cause the receiver sensing node to: transmit a sensing report including one or more sensing results associated with the modified version of the sensing reference signal.

Clause 100. The non-transitory computer-readable medium of clause 99, wherein the one or more sensing results include: a reference signal time difference (RSTD) measurement between a reception time of the sensing reference signal and the modified version of the sensing reference signal, an angle of the target object determined based on the modified version of the sensing reference signal, a Doppler measurement of the target object determined based on the modified version of the sensing reference signal, a radar cross section (RCS) of the target object determined based on the modified version of the sensing reference signal, or any combination thereof.

Clause 101. The non-transitory computer-readable medium of any of clauses 96 to 100, further comprising computer-executable instructions that, when executed by the receiver sensing node, cause the receiver sensing node to: transmit a request to configure the modified version of the sensing reference signal to indicate the one or more properties of the target object.

Clause 102. The non-transitory computer-readable medium of any of clauses 96 to 101, wherein reception of the modified version of the sensing reference signal is triggered based on: the receiver sensing node being configured to perform a bistatic sensing procedure with the transmitter sensing node, a range error associated with the target object being greater than a range error threshold, a Doppler error associated with the target object being greater than a Doppler error threshold, an angle error associated with the target object being greater than an angle error threshold, or any combination thereof.

Clause 103. The non-transitory computer-readable medium of any of clauses 96 to 102, wherein: the transmitter sensing node is a base station or a component of the base station, the receiver sensing node is a user equipment (UE), and the sensing reference signal is a downlink reference signal.

Clause 104. The non-transitory computer-readable medium of any of clauses 96 to 103, wherein: the transmitter sensing node is a user equipment (UE), the receiver sensing node is a base station or a component of the base station; and the sensing reference signal is an uplink reference signal.

Clause 105. The non-transitory computer-readable medium of any of clauses 96 to 104, wherein: the transmitter sensing node is a first user equipment (UE), the receiver sensing node is a second UE, and the sensing reference signal is a sidelink reference signal.

Clause 106. The non-transitory computer-readable medium of any of clauses 96 to 105, wherein the reference sensing node is a positioning reference unit (PRU).

Clause 107. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a reference sensing node, cause the reference sensing node to: receive, from a network node, one or more repetitions of a periodically transmitted reference signal; and transmit, to one or more receiver sensing nodes, a wakeup signal based on detection of a target object, wherein the detection of the target object is based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 108. The non-transitory computer-readable medium of clause 107, further comprising computer-executable instructions that, when executed by the reference sensing node, cause the reference sensing node to: transmit, to a sensing server, one or more sensing results reports based on reception of the one or more repetitions of the periodically transmitted reference signal.

Clause 109. The non-transitory computer-readable medium of any of clauses 107 to 108, wherein the periodically transmitted reference signal comprises: a tracking reference signal (TRS), a synchronization signal block (SSB), or a channel state information reference signal (CSI-RS).

Clause 110. The non-transitory computer-readable medium of any of clauses 107 to 109, wherein the one or more receiver sensing nodes are one or more user equipments (UEs).

Clause 111. The non-transitory computer-readable medium of any of clauses 107 to 110, wherein the network node is a base station or a component of the base station.

Clause 112. The non-transitory computer-readable medium of any of clauses 107 to 111, wherein the reference sensing node is a positioning reference unit (PRU).

Those of skill in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

Further, those of skill in the art will appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the aspects disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an ASIC, a field-programable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The methods, sequences and/or algorithms described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in random access memory (RAM), flash memory, read-only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An example storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal (e.g., UE). In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more example aspects, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

While the foregoing disclosure shows illustrative aspects of the disclosure, it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. For example, the functions, steps and/or actions of the method claims in accordance with the aspects of the disclosure described herein need not be performed in any particular order. Further, no component, function, action, or instruction described or claimed herein should be construed as critical or essential unless explicitly described as such. Furthermore, as used herein, the terms “set,” “group,” and the like are intended to include one or more of the stated elements. Also, as used herein, the terms “has,” “have,” “having,” “comprises,” “comprising,” “includes,” “including,” and the like does not preclude the presence of one or more additional elements (e.g., an element “having” A may also have B). Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a series and may be used interchangeably with “and/or,” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of”) or the alternatives are mutually exclusive (e.g., “one or more” should not be interpreted as “one and more”). Furthermore, although components, functions, actions, and instructions may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated. Accordingly, as used herein, the articles “a,” “an,” “the,” and “said” are intended to include one or more of the stated elements. Additionally, as used herein, the terms “at least one” and “one or more” encompass “one” component, function, action, or instruction performing or capable of performing a described or claimed functionality and also “two or more” components, functions, actions, or instructions performing or capable of performing a described or claimed functionality in combination.